Rose to executive status at 20th Century-Fox's feature film division in the creative advertising department; among the hits Grushow helped promote were "Broadcast News" (1987), "Big" and "Die Hard" (both 1988). He moved over to Fox's fledgling TV network in a similar capacity in 1988 and oversaw the marketing of such popular series as "The Simpsons," "Cops" and "In Living Color." Grushow added programming and scheduling responsibilities to his slate in 1990, rising to the rank of executive vice president by the time he was 30. He soon thereafter became president of the Fox Entertainment Group and was second only to Fox chair Lucie Salhany. When Peter Chernin moved from Fox's network to its feature film division, Grushow and Salhany assumed final executive control of the company's TV output, distribution and sales in the fall of 1992.